I REALLY need to stop thinking about him? Help?

There is this boy, older than me, that I REALLY love. He hardly knows I exist. What do I do. I can't stop fantasizing, thinking, talking, practically cant STFU about him! What shall I do. I try thinking about his flaws, but I got nothing. I try thinking about other boys, but nope! I try thinking about Justin Timberlake (huge celeb crush) but still, nada! There were situations where we would play truth or dare, spin the bottle, and talk but not much.